I'm not really a guru, but these are some of the general insights I get on the situation...
1. I don't think you'd get QUITE the response, but it defiantly won't be viewed upon very well.. I believe I know the particular part of the series you are referencing. If I recall correctly, it was more along the lines of leaving iron material in there realm would be considerate of dumping nuclear toxic waste off in another country.
2. Yes, and no. Generally speaking, the laws of physics can get pretty wacky in the Nevernever. There is a very definitive possibility that they could cease to function at a great moment of need. So a more reliable weapon, such as a sword, that doesn't require any physics or chemistry, other than that of simple forward momentum and a sharp pointy end, is more preferable.
3. This one is kinda a tough call... Generally speaking, anything you take out of the Nevernever, and back into the mundane world turns into icky ectoplasm, as its basic physical makeup just dissolves. Particular items of import, or very special materials only found in the Nevernever COULD though most definitely exist, I mean its perfect story/plot right there, so the system itself practically says it has to exist
Overall, I have to say that there really should be more source material on the Nevernever. Its a very huge potential use for story, RP, and plot, but with little to no real makeup, the individual ST and players are kinda left to their own devices. However, I do believe the upcoming new book is rumored, or stated, to have SOME info on the Nevernever, so I'm actually quite excited about that ^^
Hope you get some more feedback, and hope mine wasn't really off, and at least useful, hehe.